921242513 has 4 divisors (see below), whose sum is σ = 930363828. Its totient is φ = 912121200.

The previous prime is 921242467. The next prime is 921242521. The reversal of 921242513 is 315242129.

921242513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315242129 = 19 ⋅16591691.

It can be written as a sum of positive squares in 2 ways, for example, as 563730049 + 357512464 = 23743^2 + 18908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921242513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921245513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4560506 + ... + 4560707.

It is an arithmetic number, because the mean of its divisors is an integer number (232590957).

Almost surely, 2^921242513 is an apocalyptic number.

It is an amenable number.

921242513 is a deficient number, since it is larger than the sum of its proper divisors (9121315).

921242513 is a wasteful number, since it uses less digits than its factorization.

921242513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9121314.

The product of its digits is 4320, while the sum is 29.

The square root of 921242513 is about 30351.9770855211. The cubic root of 921242513 is about 973.0264750011.

The spelling of 921242513 in words is "nine hundred twenty-one million, two hundred forty-two thousand, five hundred thirteen".